Learn how to use the command line really well and a GUI just gets in the way for alot of stuff.........amazing power in just a few keystrokes.Most common shell in use is BASH or bourne again shell.Do a web search and find out more.DOS has what like 30-40 commands plus options?A linux or unix shell has way more and you can program in it as well as access all the little modular prgrams linux has available.